polltest.c

来自「盛博can驱动程序功能很全」· C语言 代码 · 共 42 行

#include  <stdio.h>
#include  <sys/types.h>
#include  <sys/stat.h>
#include  <fcntl.h>
#include  <poll.h>
#include  "sbscan.h"
int main(void)
{
 int fd;

 struct pollfd *fdarray;
 unsigned long nfds=1;
 int timeout=20;


 fd=open("/dev/can0",O_RDWR);
 if (fd<0)
    printf("open failed\n");

 fdarray=(struct pollfd *)malloc(sizeof(struct pollfd));
 fdarray->fd=fd;
 fdarray->events=POLLIN;
 
ioctl(fd,CAN_IOCRESET);
while (1) {
   poll(fdarray,nfds,timeout);
   if (fdarray->revents&POLLIN) { 
      printf("message come\n");
      
   }
   else
     printf("no message\n");
}
  
     

 if (close(fd)) 
   printf("close failed\n"); 

 return ;
}